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A. E. GUY.

. 0.1918. v Patented June 13, 1922.

DEVICE FOR GENERATIN HIGH PRESSURE.

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ALBERT E. GUY, F THEI'UNITED STATES ARMY.

DEVICE .EUR GENERATIN'G HIGH PRESSURE.

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Specification of Letters Patent. Patented Juney 13, 1922.

Application led. January 30, 1918. Serial No. 274,134.

(FILED UNDER THE ACT 0F MARGH .2., 18,83, 22 STAT. L., 625.)

To all whom t 'may concern.'

Be it known that I, Arianna? E. GUY, major, rdnance Dept., U. S. A., a citizen of the United `States, stationed at lashi-ngton, D.. C., have invented an Improvement in Device for Generating Hi gh Pressure, of which the following is a specilication.

The invention *described` herein may be used by the Government, or any of vits oliicers or employees in prosecution of work for the Government, or by any other person in the United States, -without payment of any royalty thereon. y l

This invention relates to a method of generating high pressure in tubes, involving lthe application 4of the laws of `expansion of f fluids or solids under ychange of temperature, and by suitable apparatus applying the result toA generate vhigh pressure within the tube.

.The invention is useful in treating the inner walls of a tube to increase their resistance vto internal pressure, and is particularly adapted for use in the treatment of gun tubes, which must withstand high internal pressure each time a shot is tired.

This method is useful in fitting linings in cylinders, tubes or the like, and especially for rel-ining gun tubes, and is adapted for use in connection with the process of treat- .ing tubes by pressure described in my appli- .cation S. N, 258,652, iiled October 17, 1918.

This i-'nethod is especially useful in the treatment of a gun tube, where pressure of different intensity is to be applied to different parts of the gun, to set up the required resistance to meet the various pressures throughout the gun, when fired.

The objects of the invention being` to provide for rapid and easy operatiom low cost and adaptability to a variety of conditions of manufacture and use and consists in the method and appara-tus hereinafter described and claimed.

Similar numerals indicate corresponding parts of the drawings in which is shown a preferred means and mode of applying the inventionto a Vgun tube.

Fig. 1 is a longitudinal section of a gun tube, wherein a liner is to be secured by an application of this method; and

F ig. 2 is a detail View, of one of the spacers.

The gun forging is indicated at and may be rough turned or forged to about its linal dimensions on the exterior, the interior y.method is to vbe applied to one part or another of the gun tube. Wlashers and lare arranged at the end of the gun and cylinder respectively. A

:packing 17 seals the -end of the gun .tube and ypacking 18 seals the end `of the cylinder lthrough which `the piston bar operates. .Packing 19 is provided in piston 12 and packing v20 in the piston 13.

The spacers 28 may be any llength and of any preferred nu-mber to ,provide for the application of this method to the portion of the gun .tube desired, said spacers mustbe so constructed as to yenable their .adjustment in place between vthe gun .tube washer 15 and the cylinder washer 1,6 without disassembling the parts, and may beconstructed as shown in sections provided with connecting ears 21secured .together by bolts 22.

`rl'fhe normal position of the piston 13 in cylinder' 11 @provides a space 23 between the .piston and ,theend Vof the cylinder,.said space .is filled with any suitable substance having preferably a high coefficient of expansion.

The temperature changing means may be Aof any preferred form, but for 'purposes of illustration :a circulatingapparatus 1s shown consisting .of tube 24 connected at Vits Aends with the chamber; and provided with the coil 25 .enclosed within vthe heater 26. The ,space 23 and tube 24 are filled with the r,substance above referred toand when heated,

.expands and increases the distance between the end of the .cylinder and Vthe .piston and moves. the piston rod 14 inthe direction of the arrow.

The space between the piston 12 and the washer 17 is filled by a Huid which, when' the distance between the piston and washer is diminished, exerts pressure on the interior of the tube.

1r different portions of the tube 10 are to be subjected te different internal pressures it will be clear by reference to Fig. 1 that the 'full line position oi' the parts, show them when pressure is to be applied to the breach portion of the gun tube or that portion nearest the cylinder. By inserting the spacers of the number and length shown the piston 12 will be located near the breach end of the tube, and the pressure will be applied only between the piston and the washer, or sealing member.

It a pressure of different intensity is to be applied to the central portion of the tube, one or' the spacers 28 is removed, thus permitting the piston rod 14 to extend further into the gun tube andftherefore place the Vpiston 12 in the position shown in dots at 27, and when the space between it and the washer 15 is filled, and the substance in chamber 23 expanded, the pressure will under these conditions be applied to the tube between said dotted line position 27 and the seal. l

By this method it will be clear that pressure of various intensities may be applied to the same or different portions of the interior of a tube by sealing the adjacent ends of the tube and cylinder, inserting the number of spacers between the tube and cylinder te bring the portion of the tube that it is desired to be treated `between its piston and seal, lilling the space between the piston andv seal with a Huid, and expanding the contents o'l the cylinder.

It may be here noted that with the above construction, should there be any leakage in the seal or piston, oit the gun tube, it will be compensated for by continuing the raising ofthe temperature in the cylinder.

Having thus fully described my invention what I claim as new and desire te secure by Letters Patent of the United States is:

1. A device for applying` pressureV to the interior of tubes consisting of. a cylinder mounted in axial alinement with the tube',

sealing walls in the adjacent ends of the tube and the cylinder, pistons mounted in the tube and cylinder, a connecting rod between the pistons, [luid fillers between the pistons andthe sealed ends of the tube and cylinder, and means tor changing the ternperature of the contents oil the cylinder.

2. A device for applyingpressure to dil ferent portions of the interior of tubes consisting of a cylinder mounted in line with the tube, sealing walls inthe adjacent ends el the tube and cylinder, spacers between the ends of the tube and the cylinder, pistons mounted in the tube and in the cylinder,

rigid connection and separating` the tube and the cylinder, a filler inthe tube between the piston and the sealing wall, a filler in the cylinder between the piston and the sealing wall and circulatingmeans for changing the temperature of the iiller in the cylinder.

4. A device for applying variable pressures to the interior of tubes consisting ot sealing walls mounted in the tube, one of said walls being adjustable, a fluid filler between the walls and variable pressure means for reducing the distance between the walls, after adjustment. y

5. A device for applying variable pressures to different parts of the interior of tubes consisting of sealing walls mounted in the tube, one of said walls being adjustable, a fluid filler between the sealing walls and variable pressure meanscfor forcing one of the sealing walls toward the other, after adjustment. 6. A device :tor applying pressure to the interior of tubes consisting of sealing walls mounted in the tube, one of said walls being adjustable` a fluid filler between the sealing walls, a cylinder in line with the tube, a piston in the cylinder, a connecting rod'between the piston and the adjustable wall, Iiller between the piston and the end et the cylinder and means :lor expanding the filler in the cylinder to actuate the piston and adjustable wall to compress theluid in the tube.

7. Adevice for applying pressure to dif- 'ferent portions of the interior of tubes con sisting el' sealing walls mounted in the tube, one oi: said walls being adjustable, a fluid filler between the sealing walls, a cylinder in line with the tube, arpiston in the cylinder, a connecting rod between the piston and the adj ustablev sealing wall, a spacer between the cylinder and the tube, a iiller between the piston and end of the cylinder and means for expanding Vthe {iller in the cylinder to actuate the piston and adjustable wall to compress'the fluid in the tube.

' ALBERT E. GUY. 

